
jQuery.extend({


// в jQuery	начиная с 1.5 нет метода handleError, пишем его из 1.2.5
handleError:function(s,xhr,status,e)
{
	if(s.error)
		s.error(xhr,status,e);
	if(s.global)
		jQuery.event.trigger("ajaxError",[xhr,s,e]);
},


createUploadIframe: function(id, uri)
{
	//create frame
	var frameId = 'jUploadFrame' + id;

	if(window.ActiveXObject) {
		var io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');
		if(typeof uri== 'boolean'){
			io.src = 'javascript:false';
		}
		else if(typeof uri== 'string'){
			io.src = uri;
		}
	}
	else {
		var io = document.createElement('iframe');
		io.id = frameId;
		io.name = frameId;
	}
	io.style.position = 'absolute';
	io.style.top = '-1000px';
	io.style.left = '-1000px';

	document.body.appendChild(io);

	return io;
},


createUploadForm: function(id, fileElementId)
{
	//create form	
	var formId = 'jUploadForm' + id;
	var fileId = 'jUploadFile' + id;
	var form = $('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');	
	var oldElement = $('#' + fileElementId);
	var newElement = $(oldElement).clone();
	$(oldElement).attr('id', fileId);
	$(oldElement).before(newElement);
	$(oldElement).appendTo(form);
	//set attributes
	$(form).css('position', 'absolute');
	$(form).css('top', '-1200px');
	$(form).css('left', '-1200px');
	$(form).appendTo('body');
	return form;
},


ajaxFileUpload: function(s)
{
	// TODO introduce global settings, allowing the client to modify them for all requests, not only timeout
	s = jQuery.extend({}, jQuery.ajaxSettings, s);
	var id = new Date().getTime();
	var form = jQuery.createUploadForm(id, s.fileElementId);
	var io = jQuery.createUploadIframe(id, s.secureuri);
	var frameId = 'jUploadFrame' + id;
	var formId = 'jUploadForm' + id;
	// Watch for a new set of requests
	if ( s.global && ! jQuery.active++ )
	{
		jQuery.event.trigger( "ajaxStart" );
	}
	var requestDone = false;
	// Create the request object
	var xml = {};
	if ( s.global )
		jQuery.event.trigger("ajaxSend", [xml, s]);
	// Wait for a response to come back
	var uploadCallback = function(isTimeout)
	{
		var io = document.getElementById(frameId);
		try 
		{
			if(io.contentWindow)
			{
				 xml.responseText = io.contentWindow.document.body?io.contentWindow.document.body.innerHTML:null;
				 xml.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document;
				 
			}else if(io.contentDocument)
			{
				 xml.responseText = io.contentDocument.document.body?io.contentDocument.document.body.innerHTML:null;
				xml.responseXML = io.contentDocument.document.XMLDocument?io.contentDocument.document.XMLDocument:io.contentDocument.document;
			}
		}
		catch(e)
		{
			jQuery.handleError(s, xml, null, e);
		}
		if ( xml || isTimeout == "timeout") 
		{
			requestDone = true;
			var status;
			try {
				status = isTimeout != "timeout" ? "success" : "error";
				// Make sure that the request was successful or notmodified
				if ( status != "error" )
				{
					// process the data (runs the xml through httpData regardless of callback)
					var data = jQuery.uploadHttpData( xml, s.dataType );    
					// If a local callback was specified, fire it and pass it the data
					if ( s.success )
						s.success( data, status );

					// Fire the global callback
					if( s.global )
						jQuery.event.trigger( "ajaxSuccess", [xml, s] );
				} else
					jQuery.handleError(s, xml, status);
			}
			catch(e) 
			{
				status = "error";
				jQuery.handleError(s, xml, status, e);
			}

			// The request was completed
			if( s.global )
				jQuery.event.trigger( "ajaxComplete", [xml, s] );

			// Handle the global AJAX counter
			if ( s.global && ! --jQuery.active )
				jQuery.event.trigger( "ajaxStop" );

			// Process result
			if ( s.complete )
				s.complete(xml, status);

			jQuery(io).unbind()

			setTimeout(function(){
				try 
				{
					$(io).remove();
					$(form).remove();	
					
				}
				catch(e) 
				{
					jQuery.handleError(s, xml, null, e);
				}
			}, 100);

			xml = null

		}
	}
	// Timeout checker
	if ( s.timeout > 0 ) 
	{
		setTimeout(function(){
			// Check to see if the request is still happening
			if( !requestDone ) uploadCallback( "timeout" );
		}, s.timeout);
	}
	try 
	{
	   // var io = $('#' + frameId);
		var form = $('#' + formId);
		$(form).attr('action', s.url);
		$(form).attr('method', 'POST');
		$(form).attr('target', frameId);
		if(form.encoding)
		{
			form.encoding = 'multipart/form-data';
		}
		else
		{
			form.enctype = 'multipart/form-data';
		}
		$(form).submit();

	}
	catch(e) 
	{
		jQuery.handleError(s, xml, null, e);
	}
	if(window.attachEvent){
		document.getElementById(frameId).attachEvent('onload', uploadCallback);
	}
	else{
		document.getElementById(frameId).addEventListener('load', uploadCallback, false);
	}
	return {abort: function () {}};	
},


uploadHttpData: function( r, type )
{
	var data = !type;
	data = type == "xml" || data ? r.responseXML : r.responseText;
	// If the type is "script", eval it in global context
	if ( type == "script" )
		jQuery.globalEval( data );
	// Get the JavaScript object, if JSON is used.
	if ( type == "json" )
		eval( "data = " + data );
	// evaluate scripts within html
	if ( type == "html" )
		jQuery("<div>").html(data).evalScripts();
		//alert($('param', data).each(function(){alert($(this).attr('value'));}));
	return data;
}


})

